Improved window-latch



uitrit tetra @nicht @fitta Inra-ovni) .WINDOW-LATCH.

@te tlgihu'le mirra in it than tettets utett mit mating glatt uf the time.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, ERNST F. HOFMANN, of Poughkeepsie, Dutchess county, State oi" New York, have invented a'rew and improved Window-Latch; and I do hereby declare that the following is a full, clear, and

exact description thereof, which-will enable others skilled in the art to make and use the same,` reference being had to the accompanying drawing, forming part of this specification, in which- Figure .1 represents a transverse section of this invention.v

Figure 2 is a plan or tcp view of the same.

Figure 3 is a longitudinal section of the same.

Similar letters of reference indicate like parts.

This invention consists in the arrangement of aspring-stop or catch in lcombination with an ordinary revolving latch in such a manner, that when said latch is closed it is securely locked by the spring-stop, and it cannot be opened or forced back until said stop or catch is depressed or madeA to release the latch.

A represents a revolving latch which turns on a pivot, a, securedl in a metal case, B, and which, when locked, catches over and under a ianged segmental cam, c, in such a manner that when the case containing the latch is secured to the meeting strip of the upper sash, and the flanged cam to the meeting strip of the lower sash, and the latch is turned over and made to lock in the cam, the two sashes are securely fastened, and the window cannot be opened until the latch is turned back. An ordinary latch of this kind is held in position simplyby the force ofits spring, and it can be forced back from the outside by passing a proper tool or piece of metal up between the two meeting strips, which in most windows do not it close enough to prevent the entrance of a thin piece of lsteel or iron. In order to prevent the latch being foreedback from the outside, I have added to ita spring-catch or stop, D, which consists of a notched piece of metal or other suitable material, supported by a spring, b, as

Ashown in g. 3 of the drawing, or which may be made in any other suitable manner and form. The spring which supports the stop, D, is riveted to a separate plate, c, or, if desired, said plate may be fastened to or cast -solidwith the bed-plate of the segmental cam, and the stop is so formed that when the latch is made to lock into the cam, c, it drops into the recess of the spring-stop and retains the latch firmly in position. In order to .open the latch,it is necessary irst to depress the spring-stop, D, and the operation of forcing back the latch as and for the purpose set forth.

'from the outside is rendered impracticable. A stop, c, inserted in the catch, D, prevents ythe' spring, I, from being overstrained, and the correct operation of the spring-catch is insured. By this simple attachment alatch for windows is obtained which is safe and burglar-proof, and which can only be opened from the outside if the window is smashed.

What I claim -as new, and desire to secure by Letters Patent, is f v The stop c, in combination with -th'e catch D, spring b, and latch A, constructed and operating substantially ERNST F. leioFMANN.v

Witnesses:

JOHN G. SANDKUHL, SAMUEL Dunwoolm 

